I am planning to build a laser cutter using a 100W CO2 laser and an xPro board. So far, it seems like it can control the laser's power with PWM no problem, but before I settle with that board I want to be able to see if it can support a proximity sensor. I want to integrate it so that I can have a z-axis so I can automatically and precisely focus the lens, and possibly change the focal distance if I have to do multiple cuts. Does the board have any inputs for a sensor like that? I saw some threads by mentioning laser diodes and a z-axis, but none of them mention a proximity sensor. On the spark concepts store page for the board it mentions auto-focus, but in the documentation it's never mentioned. Also, if you believe a better board is suited for the job let me know.